A fundraiser organized on Facebook to help immigrant families separated at the border has raised millions of dollars in just a few days.

By midday Wednesday, more than 250,000 people, including Facebook CEO Mark Zuckerberg and COO Sheryl Sandberg, had donated more than $10 million to the “Reunite an immigrant parent with their child” fundraiser, started by Bay Area couple Dave and Charlotte Willner over the weekend with an initial goal of raising $1,500.

A Facebook spokesperson told HuffPost that it’s the largest fundraiser to date using the social media giant’s fundraising platform.

The recipient of the funds, the Refugee and Immigrant Center for Education and Legal Services (RAICES), was overwhelmed by the support, tweeting that the organization is experiencing more donations than ever before, even causing their website to crash.

RAICES is a Texas immigration legal services provider that plans to use the proceeds to directly fund the bond payments that allow parents to be removed from detention while they wait for court proceedings as well as legal representation for children in Texan immigration courts.

“These children don’t know where their parents are. Their parents aren’t allowed to communicate with them while in custody. The government hasn’t set up a system to reunite separated parents and children if one or both are ultimately released. In many cases, parents have been deported without their children ― sometimes, young children are deported without their parents.”

“It’s clearly resonating with a lot of people, and we’re just glad we could help,” Charlotte Willner told USA TODAY.

A chorus of voices nationwide, including those of many Republicans, are rising up in opposition to the policy. Launched last month, it seeks to prosecute more immigrants entering the country illegally, even if it means separating children from their parents.

This story has been updated with comment from Facebook and the latest amount raised.